The imperial administrative system in the ninth century

John Bagnell Bury (; 16 October 1861 – 1 June 1927) was an Anglo-Irish historian, classical scholar, Medieval Roman historian and philologist. He objected to the label "Byzantinist" explicitly in the preface to the 1889 edition of his Later Roman Empire. He was Erasmus Smith's Professor of Modern History at Trinity College Dublin (1893–1902), before being Regius Professor of Modern History at the University of Cambridge and a Professorial Fellow of King's College, Cambridge from 1902 until his death.